package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R upload(MultipartFile file) {

        //获取文件后缀名
        String originalFilename = file.getOriginalFilename();
        String suffixname = originalFilename.substring(originalFilename.lastIndexOf("."));

        //随机图片文件名
        String fileName = UUID.randomUUID().toString() + suffixname;

        //判断basePath表示的文件夹是否存在
        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        try {
            //将临时图片转存
            file.transferTo(new File(basePath + fileName));

        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //获取图片文件输入流
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //获取图片文件输出流
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            //读写
            byte[] bytes = new byte[1024];
            int len = 0;
            while((len = fileInputStream.read(bytes))!= -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            fileInputStream.close();
            outputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

